same here on Mi 8 SE when V4A installs the driver and reboots the device it doesn't boot and it goes in fastboot mode. However i found a solution and what i do is unroot from TWRP and than the device booted normally.
It would be good to have V4A installed and working
After updating to MIUI 11 i got a problem with the stock camera. When I open the app it says "couldn't access SD card" and i can't take pictures. Other cameras and all other apps work perfectly.
Device is MI 8 SE